The landing gear is an attachment device that supports the aircraft and is used for ground (water surface) movement when the lower part of the aircraft is used for take-off or landing (surface) taxiing. The landing gear is the only component that supports the entire aircraft, so it is an integral part of the aircraft; without it, the aircraft cannot move on the ground. When the aircraft takes off, the landing gear can be retracted depending on flight performance.

The landing gear device is an important bearing and maneuvering component of the aircraft, and plays an extremely important mission in the safe take-off and landing of the aircraft. The landing gear is the necessary support system for take-off, landing, sprinting, ground movement and parking. It is one of the main components of the aircraft. Its performance is directly related to the safety of the aircraft.